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  1. dave081069

    Ultimate stress in a pressurized fuselage

    Koopas #2 is really about using the SRM repair as a method of determining the loads required for a modifed repair i.e. a repair in a location or configuration where a standard SRM repair cannot be accomplished.
  2. dave081069

    Ultimate stress in a pressurized fuselage

    In their Part III Structures course Boeing recommend sizing a skin repair to the lowest of: 1. Ftu 2. The load capability of the applicable SRM repair, or 3. the load capability of adjacent skin production joints. Obviously all other rules including doubler thickness, stepping/tapering and...
  3. dave081069

    shear load of 375 jo bolt needed

    The only cross ref I've found for Jo-bolt is the NAS167* etc series fasteners. NAS1675-4 is the procurement spec for these and it details the strength requirements. eg. A NAS1672-6 (0.375 CSK A-286) Class II fastener has a double shear strength of 15750 lbs min. per Table 1 of NAS1675. Hope...
  4. dave081069

    Leading edge erosion

    3M manufacture a range of polyurethane protective tapes, however these are mainly intended for wing leading edges and radomes so may not last on rotor blades. Could be a budget option though?
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